Checking The Spark Plug - Stihl HS 46 Instruction Manual

11 Checking the Spark Plug

11 Checking the Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
11.1 Removing the Spark Plug
► Stopping the Engine
► Carefully pry open the flap (1) with a suitable
tool (e.g. combination wrench).
2
► Remove the spark plug boot (2) using a suita‐
ble tool (e.g. combination wrench).
► Unscrew the spark plug.
11.2 Checking the Spark Plug
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
0458-447-8321-D
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
11.3
► Insert and screw home the spark plug by
hand.
► Tighten down the spark plug.
► Press the spark plug boot firmly onto the spark
plug.
► Close the flap (1), top first, then the bottom,
tabs (arrows) must snap into position.
A
WARNING
Installing the Spark Plug
English
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